Temporarily symlink stack.yaml to stack-master.yaml

This shall be reverted together with the .github/workflows/stack.yml
part of 229d52ff0735e1d1d8a949d221560ccdd9872e5d once xmonad 0.17 is
out.

stack-master.yaml

@@ -1,7 +1,7 @@
 # This stack.yaml is used to build xmonad-contrib with master version
 # of xmonad
 
-resolver: lts-15.3
+resolver: lts-17.14
 
 packages:
 - ./
@@ -12,5 +12,15 @@ extra-deps:
 - github: xmonad/xmonad
   commit: master@{today}
 
+nix:
+  packages:
+    - pkg-config
+    - xorg.libX11
+    - xorg.libXext
+    - xorg.libXft
+    - xorg.libXrandr
+    - xorg.libXrender
+    - xorg.libXScrnSaver
+
 ghc-options:
   xmonad-contrib: '-j'

stack.yaml

@@ -1,21 +0,0 @@
-resolver: lts-17.14
-
-packages:
-- ./
-
-extra-deps:
-- X11-1.10
-- xmonad-0.17
-
-nix:
-  packages:
-    - pkg-config
-    - xorg.libX11
-    - xorg.libXext
-    - xorg.libXft
-    - xorg.libXrandr
-    - xorg.libXrender
-    - xorg.libXScrnSaver
-
-ghc-options:
-  xmonad-contrib: '-j'

stack.yaml

@@ -0,0 +1 @@
+stack-master.yaml